update publish instructions sonatype issue

Author: bjornregnell

PUBLISH.md

@@ -88,7 +88,7 @@ Here is some more info on (unnecessary) config that was **NOT** used:
 
 8. Verify that the staged jar downloaded from sonatype works by running `scala -cp introprog_2.12-x.y.z.jar` and in REPL e.g. `val w = new introprog.PixelWindow`. The reason for this step is that there has been incidents where the uploading has failed and the jar was empty. A published jar can not be retracted even if corrupted according to Sonatype policies.
 
-9. Click the *Close* icon with a diskett above the repository list to "close" the staging repository.
+9. Click the *Close* icon with a diskett above the repository list to "close" the staging repository. No need to write anything in the "Description" field in the popup. It has happened that the Close failed - then the repo is still "Open" so try to close it again and hope it works this time...
 
 10. After a while (typically a couple of minutes) the *Release* icon with a chain above the repository list is enabled. Click it when enabled. You can keep the "Automatically Drop" checkbox checked, which means that when the repo is published on Central the staging repo is removed from the list.